tranny top----need help

[larry harding]

i just went through my tranny, new bearings, one new gear and some good used ones. everything is back together except the top. i have the gears in the neutral position and the shift forks also in the neut. position. i line up the forks and the grooves in the gears, but the forks don't want to go down in the grooves. i'm sure there is nothing wrong with the forks or gears, but it seems that i'm not lining something up right. any suggestions????